Oganization Blocks (OB)
99
S7-400 Instruction List
A5E00267845-01
Oganization Blocks (OB)
A user program for the S7-400 is made up of blocks containing the statements, parameters and data for the relevant CPU. The number of
blocks you can create or which are provided by the operating system is different for each of the S7-400 CPUs. You will find a detailed
description of the OBs and their use in the STEP 7 Programming Manual.
Organization
Blocks
CPU
412
CPU
414
CPU
414-4H
CPU
416
CPU
417
CPU
417-4H
Start Events
(Hexadecimal Values)
Free cycle
OB 1
x
x
x
x
x
x
1101, 1102, 1103, 1104, 1105
Time-of-day interrupts
OB 10
x
x
x
x
x
x
1111
OB 11
x
x
x
x
x
x
1112
OB 12
x
x
x
x
x
1113
OB 13
x
x
x
x
x
1114
OB 14
x
x
x
1115
OB 15
x
x
x
1116
OB 16
x
x
x
1117
OB 17
x
x
x
1118